I just noticed this issue as well. I got an email from CP a while back saying you no longer need to open the CP app to start the charge with NFC, or something along those lines.
I tried NFC without the CP app open at a Nissan DCFC which is supposed to cost $3 and Android pay popped up instead of the CP app. It still worked to authorize the charge and shows $1 on the Android pay app. That was on the 15th and nothing has hit my card, no $1 pre-authorization, or a $3 fee.
I tried a second time last Saturday at a different Nissan dealer, with an identical DCFC which is free, but still requires a CP card to activate. Again, Android pay popped up and the charge was authorized. Again, $1 showing in Android pay and nothing on my credit card. The following day I needed that free DCFC again and was going to make sure I opened the CP app before using the NFC to see what happened. Unfortunately, I had issues with all 3 authorization methods, CP app NFC didn't work, Android pay NFC didn't work, and my CP card didn't work. I had to call to get the charge authorized.
Have you tried using NFC with the CP app open? Or is this happening with the CP app open and running when you try?